We sanded and repainted our E-27 bottom in September. After some research, we landed on Pettit's Trinidad SR (slime resistant) RED paint. It ran at about $230ish pr. gallon. We put 2 gallons on it and got not quite 3 coats out of it. Local old salts reccommended we add cayenne pepper to the paint while applying. despite my skeptisizm, I threw some in. Opinions about how many coats varied greatly. Our local "Bottom-job" guy suggested 2 at the most and to haul out at least every other year (here in Florida) to check thru-hulls etc. Another friend who restores old boats said 4 coats at least. During the summer months here, I was astonished at how often the bottom needed cleaning/ scraping. At LEAST every other week. I swam the bottom last week and only noted a few barnacles here & there-due to the cooler water and new paint. Don't scrimp on protective gloves, clothing and especially respirators if you plan on doing the prep work yourself. Also, put down plenty of dropcloths and keep as much old material as humanly possible off the ground and out of the air. The stuff is ecollogically horrible and even worse to humans if too much material is absorbed or breathed. Be careful.
Mike